Give feedback to a QDialog from another thread

Hi!

I am new to Qt developement so this might be a very easy question for the experts out there :)

A have serveral C++ Classes handling a socket connection with a remote device. These Classes are part of an older Framework we developed some time ago (so there is no inheritance from QObject etc.).
The application has a few threads and one of them should "inform" the GUI about a certain event.

There is a QT-Dialog Window waiting for this information. So I guess, as far as I understood, I could generate a signal to solved this?!
As long as my class is not based on a QObject (and I don't want to change that) I could need some kind of model-view-controller structure. So that the signal can be generated by the controller?!

May be there is a much simpler way to achieve my goal of sending a signal to the GUI by my thread?!
Would be perfect, I somebody could help me out :)
Thank you!

J.R.

what about just creating a simple QObject class which works as a signal thrower.. make an your thread call some public function of the class which in turn emits the relevant signal to gui

Hey!
Thx for your answer.
That would be in a way a smaller version of my idea of using a model-view-controller pattern. I just wondered whether Qt offers a direct way to receive signals from a "foreign" non-Qt class!
Thanks again!

Now I got stuck by using your way of solving the problem:

3 Classes (A non-Qt, a small QObject class and a QDialog)... Idea is that the non-Qt class can report something to the dialog by using signals.

This is the small QObject class which should create a signal and call a slot in the dialog class.

Code:

---

class ControllerDialog : public QObject {
 
public:
	ControllerDialog(DialogRobot *dlgRobot);
 
public slots:
	void sendSocketReceived() {
		emit socketReceived();
	}
	signals:
	void socketReceived(){};
 
private:
	DialogRobot *dlg;
 
};

---

Here is the snippet of the connection, placed (quick&dirty) within the ControllerDialog Constructor:

Code:

---

QObject::connect(this, SIGNAL(socketReceived()),
						dlgRobot, SLOT(robotSocketComplete()));

---

And this is the part of the QDialog:

Code:

---

public slots:
    void on_btnStart_clicked();
    void on_btnFinished_clicked();
    void robotSocketComplete() { ... }

---

Problem is that connect() reports

Quote:

---

Object::connect: No such signal QObject::socketReceived() in src/draw/Qt/controller/controller_dialog.cpp:12
Object::connect: (receiver name: 'DialogRobotClass')

---

I used the search function of the forum and googled now for quite a while... And I found several HowTo's etc., but I don't see any bigger difference between my code and the samples :(

I used connect() successfully for connecting Button-Events etc., but in this case I don't see the problem :)

Use the Q_OBJECT macro!

Small macro -> big difference ;)

Thanks for your quick help guys, it really helped me a lot!